Controller for beer or other pumps.



No. 7I0,736. Patented Oct. 7, I902.

E. S. BALDWIN.

CONTROLLER FOR BEER OR OTHER PUIIPS.

(Application fllod J'u1y,16, 19011) (No Model.)

2 Sheets-Shoat l.

\X/ITHEISSESI I E JTU V N0. 7l0,736. Patented Oct. 7, I902.

E. S. BALDWIN.

CUNTROLLEB FOR BEER OR OTHER PUMPS.

(Applicltion fll d July 16, 1900.) (No Iod'el.) 2 Sheats-$heet 2.

UNITED STATES PATENT OFFICE.

EDWVARD S. BALIHVIN, OF PEABODY, MASSACHUSETTS, ASSIGNOR TO THE BOSTON PUMP COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORA- TION OF MAINE.

CONTROLLER FOR BEER OR OTHER PUMPS SPECIFICATION forming part of Letters Patent No. 710,736, dated October 7, 190 2.

Application filed July 16, 1900. Serial No. 23,75 t. (No model.)

To all whom, it nuty concern:

Be it known that I, EDWARD S. BALDWIN, of Peabody, in the county of Essex and State of Massachusetts, have invented certainnew and useful Improvements in Controllers for Beer or other Pumps, of which the following is a specification.

This invention relates to a controller for maintaining a predetermined pressure in a I0 receptacle; and it consists in the novel fea tures of construction and relative arrange ment of parts hereinafter fully described in the specification, clearly illustrated in the drawings, and particularly pointed out in the claims.

Figure 1 represents a side elevation of a machine constructed in accordance with my invention, showing the controller in connection with an electrically-operated pump. Fig.

2 represents a top plan view of the controllerlevers and their arrangement. Fig. 3 represents a side elevation of the controller separated from the pump-frame. Fig. 4 represents a view similar to Fig. 3 looking from the opposite side of the machine. Fig. 5 represents a detail. view of the contact and dia phragm levers, showing the said levers at a point between their positions in Figs. 1 and I 3. Fig. 6 represents a detail view of the diaphragm and contact levers, showing the position of the parts when the carbons are in contact.

The same reference-figures represent the same parts in all of the figures.

1 represents the base-plate of the machine;

2, a motor-stand; 3, a shaft carried by standards 4. Upon this shaft is mounted an electric motor 5, by which motion is imparted to the shaft 6 is a disk mounted upon a shaft 7, suitably mounted in bearings, (not shown,) said shaft being arranged to be driven by the shaft 3, preferably by a worm connection, (not shown,) as is common in this class of pumps.

8 represents a pump-cylinder; 9, the crank pivoted at one end to the disk 6 and hinged at its other end to the piston-head. (Not shown.)

Preferably another pump, in all respects like the parts 6, 7, 8, and 9, is similarly mounted in the framework upon the opposite side from that shown in Fig. 1, it being customary in this class of machines to have a duplex pump.

The form of pump shown is particularly adapted for pumping air; but my invention is not limited to air-pumps, but may be employed in connection with any pump.

10 represents a pipe connected with the pipe system of the pump between the cylinder S and the reservoir 01" chamber where the contents of the pump are stored under pressure until they are wanted, or such pipe may connect directly with said chamber. This pipe is provided with a pressure-gage 11, designed to show the pressure in the pipe and chamber or receptacle. The pipe 10 communicates with the lower half of the diaphragm-chamber 12. The interior of the chamber is not shown, as it is a well-known construction, and any preferred form of diaphragm or pressure chamber maybe employed. In general these diaphragm chambers comprise two chambers separated by the diaphragm. One side of the diaphragm is subjected to pressure, while a finger or spindle on the opposite side of the diaphragm, by suitable lever connections, is employed to either indicate or make use of the movements of the diaphragm due to changes of pressure.

13 represents a spindle connected to the upper side of the diaphragm.

14c represents a tightening-nut.

The spindle 13 is arranged to bear against the under side of the lever 15, said spindle engaging the lever between its pivoted end 16 and the opposite end of the lever where the load is applied.

17 represents a standard secured to the base of the machine provided with two laterally-extending arms 18, arranged the one above the other below the lever 15, between the spindle 13 and the free end or load end of the lever. Each of the arms 18 is provided with a set-screw 19, by which the extent of 5 movement of the lever 15 may be regulated.

The current of the motor is supplied by a circuit represented by the wires 20. The circuit is closed and opened by a switch of any preferred type (not shown) for the initial starting or stopping of the motor when it is desired to put it out of connection entirely. The circuit is also adapted to be broken by means of two carbon contact-points 3O 30, for purposes to be hereinafter set out. The lower contact-point 30 is carried by a suitable bracket 31, connected to the binding-post 32, which carries the end of the wire 20. The upper contact-carbon 30 is suitably secured to the end of a resilient finger 33. The opposite end of this finger is secured to one end of alever, hereinafter called the diaphragmlever, 34. The finger 33 and lever 34in the form shown in the drawings are secured together by screws; but any preferred method of fastening the two ends of the levers together may be employed. When the contact-points 30 are in engagement, the current passes by the wire 20 through said carbons, the arm 33, lever 34, post 35 to the compleinental wire 20, and so on through the remainder of the circuit, which is not shown, being of the ordinary conventional form, the point being that there are introduced into the circuit the carbon make-and-break points 30 30.

The contact-lever 34 is pivoted between its ends to a post 35. The free end of the contact-lever 34 is weighted, as at 36, and is further provided with a lug 37. In the drawings this lug appears upon the side of the weight 36; but this is not essential, as it might be differently positioned, and in place of the weight aspring might be employed. I prefer, however, the weighted end for simplicity of construction, where the lever 34 works in a vertical plane. The free end of the lever 15 may, if desired, be equipped with a weight 40.

41 represents alug on the lever 15, near its free end. A link 42 is pivoted at one end to the lug 41.

43 represents an arm, one end of which is pivoted to the link 42, the other end of which is secured by a screw 44 to a shaft 45, mounted in the posts 46.

Referring to Figs. 3 and 4, it will be noted that the posts 35 and 46 are extended up from the plate 80, while the bracket 31 and bindingpost 32 extend up from the base 81. These bases are separated from each other, as shown in Figs. 1, 3, and 4, and between said bases and the base of the machine is interposed insulating material 82. The connection 83 between the lug 41 and lever 42 is also insulated. By this arrangement it will be seen that the controller is entirely insulated from the rest of the machine and that the complemental parts of the controller are insulated from each other, and also, by means of the insulation 83, they are insulated from the lever 15.

50 is a lever secured to the shaft 45 and extending up beside the weighted end 36 of the contact-lever 34. The lever 50, hereinafter referred to as a diaphragm-lever, may be of any preferred shape; but the form shown in the drawings is of a general triangular shape, the pivotal point being at the apex. The diaphragm-lever 50, near its free end and upon the side adjacent the weighted end 36 of the contact-lever, is recessed, as at 51, the recess commencing at a point at 52 near the middle of the lever,running upward on a line 53, and then running across the lever on a line 54, the material being removed, with the exception of suflicient to form the lug 55 at the top end of the lever, leaving a recess or path 56 between the wall 53 and the lug 55. The side of the lug 55 is cut away on a line 57, whose direction is toward the opposite side of the arm instead of toward the apex of the arm, thus forminga shoulder 58. The point at which the line and shoulder 58 meet, instead of being directly beneath the edge of the cut, is at a distance underneath the lug 55, so that when the sharp edge of the lug 37 leaves the sharp edge of the lug 55 it will drop immediately without any obstruction.

Referring to the lugs 37. and 55 in the position shown in Fig. 6, these lugs upon their opposing facesthat is, faces that are approaching each otherare beveled in opposite directions, and the reverse faces of these lugs-to wit, the right-hand face of the lug 55 in Fig. 6 and the left-hand face of the lug 37 in Fig. 6are also oppositely beveled, in order that the lug 37.when it leaves the lug 55 will have an unobstructed passage to the point of rest.

59 represents a spring secured at one end to the diaphragm-lever and having its free end arranged over the walls 53 54 and between the said walls and the lug 55.

It will be noted that the lug 37 is of ageneral angular shape, having a substantially broad flat face at the bottom that contacts with the upper face of the lug 55, so that'as the lug 37 passes up on the spring 59 it engages the lug 55, as well as the spring, by a wedging action to more readily force the spring to one side, while when it has reached the point of elevation shown in Fig. 6 a reverse motion of the lever 50, instead of causing the lug 37 to retravel its upward track, will cause it to slide across the intervening space between the normal position of the spring 59 and lug 55 and cause the lug 37 to slide upon the top surface of the lug 55. The top surface of the lug 55, beginning at the right hand in Fig. 6, is backed away toward the center, and the right-hand side of the log 37 is rounded and backed in the opposite direction in order to insure the lug 55 when the lever 50 moves to the left in Fig. 6 engaging the under side of the lug 37, and, further, by the further mo-' tion of said lever 50 to hold down the carbons 30, increasing the contact until the lugs separate, as heretofore described, thereby keeping the carbons firmly in contact until they are suddenly parted, the mechanism resulting in holding the carbons the firmest together immediately before they are separated.

The diaphragm-lever is given an oscillating motion by reason of its lever connection with the diaphragm, and as said lever 50 oscillates back and forth the lug 37 of the contact-lever rides up the spring 59, being engaged by lug 55, depresses the spring, continues on between the spring and lug until it passes to the point shown in Fig. 6. If now the diaphragm-lever in Fig. 6 be thrown to the left, the lug 37 will ride upon the top surface of the lug 55, said surface being, as stated, slightly eccentric, in order to insure the lug 55 passing underneath the lug 37 and to keep tension on the spring 33 until the lug 37 passes to the right end of the edge of the lug 55, when the weighted end 36 will drop upon the hub of the arm 50, bringing the said lug 37 down to the point shown in Fig. etand in Fig. 3. It is desirable that the weight 36 be sufficient to give the contact-lever a rapid motion downward in order to separate the carbons 30 instantly, and thus avoid sparking. The contact of the weight 36 on the hub of the arm 50 will be with anon-resilient blow to prevent giving a reverse jump or spring to the carbon, as might be the case if the lug 37 dropped far enough to engage the spring 59. Preferably said lug does not engage said spring until the arm 50 has been given a slight movement by the fall of the diaphragm after the carbons are separated. The connection between the contact-lever and the diaphragmlever (see Figs. 3, 4, and 5) is a loose connection. Then the parts are in the position shown in Figs. 1 and 6, the carbons are in contact and are held in contact under resilient pressure until the parts drop to the position shown in Fig. 4 or Fig. 3, in which position any slight motion given the diaphragmlever 50 will have no practical effect upon the contact-lever, the latter remaining inactive until a considerable motion is given the diaphragm-lever, when by reason of the springs and 59 the carbons are put under a spring contact and so held until the lug passes to the point shown in Fig. 3. It should be remembered that the carbons are not in contact until the lug 37 reaches the position shown in Fig. 6 and that when the contact is broken and the lug 37 is in the position shown in Fig. 4n the vibrations of the lever 50 have no effect in contacting the carbons. The motion of the lever 50 to the position shown is sufficient for the play or allowance of the irregular vibrations of the diaphragm to which reference has been made, and further movement of the lever 50 only takes place when there is a fall of the pressure or a substantial or material change in the position of the diaphragm, which under these conditions will continue to move until the lug 37 is brought to the position shown in Fig. 6. After the lug has reached the position shown in Fig. 6 the carbons cannot be thrown apart until the lug 37 passes over the lug 55 and is dropped down to the point shown in Fig. at. By this construction not only am I enabled to produce a highlyefticient form of controller, but, further, a controller that. is free from the objections existing in other controllersto wit, their sensitiveness to slight variations in the diaphragm when the pressure in the diaphragm is substantially of a predetermined degree. Under such circumstances various causes give rise at intervals to slight fluctuations in the diaphragm. If now the connection between the contact-lever and the diaphragnr lever is a rigid one or a fixed one, this variation of the diaphragm will cause the carbons to approach and recede from each other, causing sparking, which practically prohibits the use of the controller. In my invention, as stated, this and other defects are overcome, the loose connection between the con tact-lever and diaphragm-lever ailording the diaphragm an opportunity for the vibrations referred to without affecting the contact-lever, while any substantial movement of the diaphragm, due to a substantial change of pressure, at once throws the diaphragm-lever 50 from the position shown in Fig. 4 by the position shown in Fig. 5 to the position shown in Figs. 1 and U, which position of parts cannot be departed from except by the passage of the lug 37 along, over, and beyond the lug 55, which can only be brought about by a substantial movement of the arm or lever 50, brought about by the substantial movement of the diaphragm, due to the substantial and the required degrees of the pressure of the diaphragm or pressure chamber.

Briefly stated, the operation of my device is as follows: The main switch being closed and the pressure in the diaphragm-cylinder being either at or below the required pres sure, the carbons 30 will be in contact, thus enabling the motor to work the pump. As the pressure in the diaphragm-cylinder reaches the required degree the diaphragm is thrown upward, forcing the spindle 11; against the lever 15, raising the latter. The upward motion of the leverl5 draws the arm 43 upward in Figs. 1 and 4, throwing the diaphragm-lever 50 to the right in Fig. 1 and to the left in Fig. 6 until the lug 37 passes the lug 55 and is forced by the action of gravity to the point shown in Figs. 3 and 4, whereby the current is broken and the motor stopped, in which position the parts will remain until the pres sure falls below the required point. The fall of the pressure, as stated, is accompanied by the fall of the diaphragm, pulling down the pin 13 and permitting the lever 15 to drop. The dropping of the lever 15 pushes down the arm a3. (See Figs. 1, 2, 3, and 4c.) This motion of the arm 43 forces the diaphragm-lever, as stated, to the right in Fig. 1 and to the left in Fig. 5 until the lug 37 drops by the lug 55. Vhen the contact-lever is operated by the diaphragm, as stated, the contact-lever 50 is thrown to the right in Fig. 4., this motion continuing until the lug 37 has reached the point shown in Fig. 6that is to say, has passed up along the spring 59 and snapped over the end of the lug 55, whereby the carbons 30 are yieldingly held in contact.

Having thus explained the nature of my invention and described a way of constructing and using the same, though without attempting to set forth all the forms in which it may be made or all the modes of its use, what I claim, and desire to secure by Letters Patent, is-

1. Acontroller comprisinga pressnremember, alever connected therewith and adapted to be moved by the variations of pressure in said member, a contact-lever, and a loose connection between said levers, having locking means to prevent reverse movement of the contact-lever.

2. A circuit-breaker comprising a lever carrying a contact part, a movable member formed with a spring-guarded passage, and a part on said lever adapted to be forced through said passage, and prevented by said spring from rentering the said passage at its point of exit.

3. A controller comprising a pressure member, a pressure-lever controlled thereby, a contact-lever, said levers being disconnected, but formed with coacting parts whereby said contact-lever is actuated in one direction only by said pressure-lever.

4:. A controller comprising a pressure member, a lever controlled thereby and formed with a springuarded slot, and an abruptlyshouldered lug, a contact-lever having a member arranged to be forced through said slot and over said lug by the action of the said pressure-lever.

5. Acontroller comprising a pressure member, alever controlled thereby and formed with a spring-guarded slot, and a lug, a contactlever having a member arranged to be forced through said slot and over said lug by the movement of the said pressurelever, said member and lug at their opposing ends being beveled in opposite directions to insure the lug passing under the member, and said lug and member being upon their reverse sides oppositely beveled so that the member may have an unobstructed fall from the edge of the lug to the point of rest.

6. A controller comprising a pressure member, a reciprocating pressure-lever controlled thereby, formed with a spring-guarded slot, and an abruptly-shouldered lug, a yielding contact-lever having a member arranged to be forced through said slot and over said lug by the movement of said pressure-lever, and provided with means for returning to its inoperative position, after it has passed said lug.

In testimony whereof I have affixed my signature in presence of two witnesses.

EDWARD S. BALDWIN.

Witnesses:

A. D. HARRISON, H. L. ROBBINS. 

